Base Currency and Variable Currency

Base Currency and Variable Currency
When you trade, you will always trade a combination of two currencies. For example, you will buy US dollars and sell euro. Or buy euro and sell Japanese yen, or any other combination of dozens of widely traded currencies. But there is always a long (bought) and a short (sold) side to a trade, which means that you are speculating on the prospect of one of the currencies strengthening in relation to the other.
The trade currency is normally, but not always, the currency with the highest value. When trading US dollars against Singapore dollars, the normal way to trade is buying or selling a fixed amount of US dollars, i.e. USD 1,000,000. When closing the position, the opposite trade is done, again USD 1,000,000. The profit or loss will be apparent in the change of the amount of SGD credited and debited for the two transactions. In other words, your profit or loss will be denominated in SGD, which is known as the price currency. As part of our service, Saxo Bank will automatically exchange your profits and losses into your base currency if you require this.
Dealing Spread, but No Commissions
When trading foreign exchange, you are quoted a dealing spread offering you a buying and a selling level for your trade. Once you accept the offered price and receive confirmation from our dealers, the trade is done. There is no need to call an exchange floor. There are no other time-consuming delays. This is possible due to live streaming prices, which are also a great advantage in times of fast-moving markets: You can see where the market is trading and you know whether your orders are filled or not.
The dealing spread is typically 3-5 points in normal market conditions. This means that you can sell US dollars against the euro at 1.7780 and buy at 1.7785. There are no further costs, commissions or exchange fees.
This ensures that you can get in and out of your trades at very low slippage and many traders are therefore active intra-day traders, given that a typical day in USDEUR presents price swings of 150-200 points.